If you extend Thread you implicitly implement Runnable, because Thread IS-A Runnable. As Thread is not an abstract class it must provide an implemenation of the run() method, which it does; an empty one. Therefore you don't have to implement the run() method in your Thread subclass, even if you explicitly specify that it should implement the Runnable interface. It just doesn't make any sense not to override the run() implementation you inherit from the Thread class, because it does nothing and returns, which isn't terribly usefull. [ March 27, 2008: Message edited by: Jelle Klap ]
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